The most famous of the wraiths were the Ringwraiths, Men ensnared by Sauron's Nine Rings.[7] Some of the victims of the Ringwraiths, too, could be transformed into wraiths, albeit lesser and under their command (although no such being is known to have existed).[2] This nearly happened to Frodo Baggins, after having been stabbed by the Morgul blade of the Witch-king.[1]

Wraiths are the most common of the three type of ghosts (the other being phantoms and wights). The wraith is without a physical, tangible form, and consists only of the soul of a person wishing to fulfil an evil goal after his or her death.[15]